JP3574635B2 - High voltage cable power display - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a high-voltage cable power application display device that detects the presence or absence of a voltage applied to a high-voltage cable, and more particularly to a high-voltage cable power application display device that visually displays a power application state.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as this type of a high-voltage cable power display device, there are devices disclosed in JP-A-1-315215 and JP-A-2000-55944, which are shown in FIGS. 8 and 9 show the entire cross-sectional configuration diagram of a conventional power display device for each high-voltage cable.
In FIG. 8, a conventional high voltage cable power display device is a high voltage device having a conductive or semi-conductive grounded coating on the outer periphery of the insulating layer 112. A conductive or semi-conductive non-ground portion 113b separated from the surrounding conductive or semi-conductive ground covering portion 113a is provided in a part thereof, and the non-ground portion 113b and the ground covering portion 113a are formed on a liquid crystal display. A power application display is formed by being electrically connected via the unit 102, and when a predetermined high voltage is applied to a high-voltage device, the liquid crystal display unit 102 is displayed to indicate that voltage is being applied. It was done.
As described above, the non-ground portion 113b, the liquid crystal display portion 102, the ground covering portion 113a, and the like constitute a power application display as a whole. When a predetermined high voltage is applied to a high-voltage device, the liquid crystal display portion 102 operates. It is easy to indicate that the power is on.
[0003]
Further, in FIG. 9, in the conventional power display device for a high-voltage cable, a shielding layer 213 made of a conductive material is disposed around a center conductor 211 via an insulating layer 212, and the outer periphery is further covered with an insulating outer skin. A high-voltage cable 210 used with the shielding layer 213 grounded, and at a predetermined position of the high-voltage cable 210, a part of the shielding layer 213 is not electrically connected to another grounded part of the shielding layer 213. A drive electrode 213b formed as a state, and an electro-optical element 202 that changes its visual state when a voltage equal to or higher than a predetermined threshold is applied, one electrode being on the shielding layer 213 and the other electrode being on the drive layer And a power display unit electrically connected to the electrode 213b.
[0004]
As described above, the drive electrode 213b separated from the shield layer 213 is provided near the center conductor 211, and the electro-optical element 202 is connected to the shield layer 213 and the drive electrode 213b. In the case of (1), a partial pressure is generated with the capacitance between the drive electrode 213b and the center conductor 211 and the fixed capacitance component of the electro-optical element 202, and a predetermined voltage is applied to the electro-optical element 202. In this state, the display of each electro-optical element 202 in the power applied state of the high-voltage cable 210 and the display of the electro-optical element 202 in the power failure state are made different from each other. I can let you know. The capacitance between the drive electrode 213b and the center conductor 211 is determined by the size of the drive electrode 213b, the positional relationship with the center conductor 211, and the interposed insulating layer 212, and hardly changes. The display 202 is not easily affected by changes in the surrounding environmental conditions, and a stable display can be performed. Further, the power display unit is integrated with the high-voltage cable 210, so that it is not necessary to attach and detach the power display unit, and the usability is significantly improved.
[0005]
[Problems to be solved by the invention]
Since the conventional power display device for a high-voltage cable is configured as described above, a light-emitting diode (LED), a liquid crystal (LCD), a neon tube, or the like is used for the display unit, all of which are expensive. Had issues. Although the display unit using the light emitting diode has a life of about 20,000 hours, the current consumption is as large as 10 mA to 20 mA, and a rectifying circuit must be provided to supply a direct current, which complicates the circuit configuration. There was a problem that. In addition, a liquid crystal display unit can be driven and controlled at a lower current consumption than a light-emitting diode and has a long life, but requires a DC power supply and a drive circuit for drive control. There is a problem that the configuration becomes complicated and the probability of occurrence of a failure increases.
Further, the display section using a neon tube has a problem that the life is extremely short, about 2,000 hours, and the state of power application cannot be reliably displayed.
[0006]
SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-described problems, and has as its object to provide a high-voltage cable power-supply display device capable of performing a long-life power-supply display with a simple circuit configuration.
[0007]
[Means for Solving the Problems]
The power application display device for a high-voltage cable according to the present invention is a power application display for a high-voltage cable for displaying an application state of a high-voltage cable formed by laminating an insulating layer, a shielding layer, and an insulating sheath on an outer periphery of a center conductor. A grounded shielding layer portion and a non-grounded non-grounded shield which are grounded while the conductive material or the semiconductive material forming the shielding layer of the high-voltage cable are grounded, and the conductive material or the semiconductive material is separately formed and grounded A layer portion, a polymer dispersed liquid crystal connected between the ground shielding layer portion and the non-ground shielding layer portion, and a polymer dispersed liquid crystal disposed between the polymer dispersed liquid crystal and the insulating layer of the high-voltage cable. A power application drawing unit that draws the presence or absence of a power application state of the high-voltage cable at a predetermined interval from the high-voltage cable, the polymer dispersed liquid crystal, and an electrode lead of the polymer dispersed liquid crystal are integrally molded to form the motor. A mold is formed between the polymer-dispersed liquid crystal and the power drawing unit with a thickness equal to or greater than the predetermined distance, and a cavity is formed in a substantially central portion of the region facing the power drawing unit. It has a transparent resin.
[0008]
As described above, in the present invention, the shielding layer of the high-voltage cable is separated into a grounded shielding layer portion to be grounded and a non-grounded shielding layer portion that is not grounded, and a polymer is interposed between the grounded shielding layer portion and the non-grounded shielding layer portion. Dispersion type liquid crystal is connected, a power application drawing unit is drawn on the back side of the polymer dispersion type liquid crystal for a predetermined distance to draw the presence or absence of a voltage application state of the high voltage cable, and the polymer dispersion type liquid crystal and the power application drawing unit are arranged. During this time, a transparent resin is filled by a thickness corresponding to a predetermined interval, and a cavity is formed in a region of the substantially central portion of the transparent resin which faces the power application drawing portion. AC drive can be performed with the charging current of the ground shield layer, and the visibility of the power application drawing section can be maintained as much as possible even when the transparent deterioration or discoloration occurs due to aging. Circuit configuration and long life It is a real mosquito power display.
[0009]
Further, the power application display device of the high voltage cable according to the present invention may be configured such that the predetermined interval of the transparent resin blocks light reflected by the power application drawing unit in a non-driving state of the polymer dispersed liquid crystal, as needed. The distance is set so that the display contents of the section cannot be recognized .
[0010]
As described above, in the present invention, by setting the transparent resin between the polymer-dispersed liquid crystal and the power-drawing unit at a specified predetermined interval, characters and the like drawn in the power-drawing unit can be converted to the polymer-dispersed liquid crystal. The display can be switched depending on the driving state, and more accurate and reliable display can be performed.
[0011]
Further, in the power supply display device for a high-voltage cable according to the present invention, the transparent resin to be molded is formed, as necessary, at the outer peripheral portion of the polymer-dispersed liquid crystal with a thickness equal to or greater than the predetermined interval. As described above, in the present invention, since the outer peripheral portion of the polymer-dispersed liquid crystal is formed of a transparent resin having a thickness equal to or greater than the predetermined distance, the portion facing the power application drawing portion is a hollow portion of the transparent resin. Thus, even when the transparent resin deteriorates or discolors due to aging of the transparent resin, the accurate visibility of the power application drawing unit can be maintained.
[0012]
The high-voltage cable power display device according to the present invention has a structure in which a plurality of polymer-dispersed liquid crystals are stacked and arranged as necessary. As described above, in the present invention, since a plurality of polymer-dispersed liquid crystals are arranged in a stacked state, the distance between the polymer-dispersed liquid crystal and the power application drawing unit can be arranged closer to each other. The structure can be reduced in thickness.
[0013]
The high-voltage cable power display device according to the present invention is provided with a transparent sheet for shielding ultraviolet rays on the surface of the polymer-dispersed liquid crystal, if necessary. As described above, in the present invention, since the transparent sheet for shielding ultraviolet rays is disposed on the surface of the polymer dispersed liquid crystal, the polymer dispersed liquid crystal can be used even in an outdoor use environment where sunlight is directly irradiated. Deterioration can be prevented as much as possible.
[0014]
Further, the power application display device for a high-voltage cable according to the present invention is one in which the power application drawing unit draws the presence or absence of the power application state on the plate of the phosphorescent material as needed. As described above, according to the present invention, the presence or absence of the state of application of electricity is drawn on the plate of the light storage material to form the power application drawing unit, so that the light accumulated in the light storage material is drawn even in a dimmed state. The content can be displayed as a backlight, and more accurate and reliable display can be performed.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
(First embodiment of the present invention)
Hereinafter, a specific example in which the high voltage cable power display device according to the first embodiment of the present invention is applied to an intermediate connector will be described with reference to FIGS. FIG. 1 is an overall schematic configuration diagram of a high-voltage cable power application display device according to the present embodiment, FIG. 2 is an enlarged view of a main part of the high-voltage cable power application display device shown in FIG. 1, and FIG. FIG. 4 is an operation equivalent circuit diagram of a main part, and FIG. 4 is a power application display diagram of the high voltage cable power application display device shown in FIG.
[0016]
In each of the drawings, the high-voltage cable power display device according to the present embodiment includes a conductive layer for forming a shielding layer 13 of a high-voltage cable 10 in which an insulating layer 12, a shielding layer 13, and an insulating sheath are laminated on the outer periphery of a central conductor 11. The conductive material or the semiconductive material is grounded to GND, and the conductive material or the semiconductive material is separately formed to be grounded, and the grounded shielding layer 13a and the non-grounded non-grounded shielding layer 13b are connected to the ground. A polymer dispersed liquid crystal 2 connected between the shielding layer 13a and the non-grounded shielding layer 13b; and a polymer dispersed liquid crystal disposed between the polymer dispersed liquid crystal 2 and the insulating layer 12 of the high-voltage cable 10. And a power application drawing unit 3 that draws the word "charge" indicating the power application state of the high-voltage cable 10 at an interval L1 from the power supply unit 2. The polymer dispersed liquid crystal 2 and the power application drawing unit 3 are arranged on the side wall of the intermediate connector 1 for connecting the high-voltage cable 10.
[0017]
The polymer-dispersed liquid crystal 2 and the connection portions of the electrode lead portions 21 and 22 and the lead wires 23 of the polymer-dispersed liquid crystal 2 are integrally molded with a transparent resin 4, and the molded transparent resin 4 is a polymer. In this configuration, the outer peripheral portion 41 of the dispersion type liquid crystal 2 is formed to have a thickness equal to or greater than the distance L1. In the transparent resin 4, a cavity 43 is formed in a central portion of the transparent resin 4 in a region facing the power application drawing portion 3.
As described above, the transparent resin 4 has the hollow cavity 43 formed therein, and the thin transparent portion 42 at the center allows the visibility of the power application drawing unit 3 even when the transparent deterioration or discoloration occurs due to aging. Can be maintained as much as possible. Further, since the transparent resin 4 has the outer peripheral portion 41 having a thickness larger than the interval L1, display according to the driving state of the polymer dispersed liquid crystal 2 can be reliably performed. That is, the distance L1 needs to be a distance that blocks the reflected light from the power application drawing unit 3 when the polymer dispersed liquid crystal 2 is not driven and that the display content of the power application drawing unit 3 cannot be recognized. is there.
[0018]
Next, the operation of the power application display of the high voltage cable power application display device according to the present embodiment based on the above configuration will be described. It is assumed that the construction section of the aerial high-voltage distribution insulated wire (not shown) is in a state where power can be cut off in advance. Since the ungrounded shielding layer 13b is provided in a predetermined size (area) near the center conductor 11, the polymer dispersed liquid crystal 2 connected between the ungrounded shielding layer 13b and the center conductor 11 is also unique. , And can be considered as a kind of capacitor. When the insulated wire for overhead high-voltage distribution is in a charged state and a voltage is applied to the central conductor 11 of the high-voltage cable 10 serving as a bypass cable, the capacitance between the ungrounded shielding layer 13b and the central conductor 11 is provided. , And a partial pressure is generated in accordance with the capacitance component of the polymer dispersed liquid crystal 2, and a predetermined voltage is applied to the polymer dispersed liquid crystal 2.
[0019]
The voltage application display device of the high-voltage cable according to the present embodiment can be considered as an equivalent circuit as shown in FIG. 3, and the voltage V applied to the polymer dispersed liquid crystal 2 is expressed by the equation V = Cd · E / (Cd + C). Given. Here, E is the voltage applied to the center conductor 11, Cd is the capacitance between the ungrounded shielding layer 13b and the center conductor 11, and C is the capacitance of the polymer dispersed liquid crystal 2. The capacitance Cd between the ungrounded shielding layer 13b and the center conductor 11 is uniquely determined by the properties of the insulating layer 12 and the insulating cylinder (the case of the intermediate connector 1) and the arrangement of the ungrounded shielding layer 13b. Since the value does not change and the value does not change, the condition of the operating voltage V of the polymer dispersed liquid crystal 2 can be determined from the above equation. The area of the non-ground shielding layer 13b is set so that the operating voltage V is sufficiently higher than the minimum operating voltage of the polymer dispersed liquid crystal 2.
[0020]
In this way, when a predetermined operating voltage is applied between the two electrodes of the polymer dispersed liquid crystal 2 in the charged state, the polymer dispersed liquid crystal 2, which has been in an opaque state due to the properties of the liquid crystal, is made transparent and becomes opposite to the opposite side. As shown in FIG. 4, the word “charge” of the placed power application drawing unit 3 appears as shown in FIG. 4, indicating that the high voltage cable 10 serving as the bypass cable is in the power application state. This display can be easily visually recognized by an operator from the outside, and it can be confirmed without error that the overhead insulated wire to which the high-voltage cable 10 is connected is in the charged state.
[0021]
(Second embodiment of the present invention)
A high-voltage cable power display device according to a second embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a cross-sectional view of a main part of the high-voltage cable power application display device according to the present embodiment, and FIG. 6 is an operation equivalent circuit diagram of the main part shown in FIG.
In each of the drawings, the high-voltage cable power-applying display device according to this embodiment includes a ground shielding layer portion 13a and a non-ground shielding layer portion 13b, as in the embodiment shown in FIGS. 2, a power application drawing unit 3, and a transparent resin 4. In addition to this configuration, the two polymer-dispersed liquid crystals 2a and 2b are stacked and formed. Each of the two polymer-dispersed liquid crystals 2a and 2b has a configuration in which a capacitance component is connected in series as a capacitor.
[0022]
The two polymer-dispersed liquid crystals 2a and 2b have lead wires 23 and 24 connected to the electrode lead portions 21a and 21b on one end side, respectively, and the electrode lead portions 22a and 22b on the other end side are connected in a folded manner. The connection is made with a connection clip 22c.
Since the two polymer-dispersed liquid crystals 2a and 2b are disposed in a stacked state as described above, the “charging” of the power application drawing unit 3 located on the back side of the polymer-dispersed liquid crystals 2a and 2b when not driven. Cannot be recognized without being transmitted. The distance L2 from the stacked polymer dispersed liquid crystals 2a, 2b to the power application drawing unit 3 can be shorter than the distance L1 in the embodiment shown in FIG.
FIG. 7 shows a power application display mode diagram of a power application display device for a high-voltage cable according to another embodiment. In FIG. 7, the intermediate connector 1 has a bifurcated configuration and is displayed on the outer wall. I have.
[0023]
【The invention's effect】
In the present invention, the shielding layer of the high-voltage cable is separated into a grounded shielding layer portion to be grounded and a non-grounded shielding layer portion not grounded, and a polymer dispersed liquid crystal is interposed between the grounded shielding layer portion and the non-grounded shielding layer portion. Is connected to the back side of the polymer dispersed liquid crystal, and a power application drawing unit which draws the presence or absence of a voltage application state of the high voltage cable is disposed between the polymer dispersed liquid crystal and the power application drawing unit. The transparent resin is filled by a thickness corresponding to a predetermined interval, and a hollow portion is formed in a region substantially at the center portion of the transparent resin opposite to the power application drawing portion. It can be driven by AC with the charging current of the part, and the visibility of the power application drawing part can be maintained as much as possible even if transparent deterioration or discoloration occurs due to aging, and a simple circuit configuration without the need for a rectifier circuit / drive circuit etc. And long service life Shows there is an effect that it is.
[0024]
In the present invention, by setting the transparent resin between the polymer-dispersed liquid crystal and the power-drawing unit at a specified predetermined interval, characters and the like drawn on the power-drawing unit can be changed according to the driving state of the polymer-dispersed liquid crystal. The display can be switched and displayed, so that more accurate and reliable display can be performed .
[0025]
Further, in the present invention, since the outer peripheral portion of the polymer-dispersed liquid crystal is formed of a transparent resin having a thickness equal to or more than the predetermined interval, a portion facing the power application drawing portion becomes a hollow portion of the transparent resin. In addition, even when the transparent resin deteriorates or discolors due to aging of the transparent resin, it has an effect that accurate visibility of the power application drawing unit can be maintained.
Further, in the present invention, since a plurality of polymer dispersed liquid crystals are arranged in a laminated state, the distance between the polymer dispersed liquid crystal and the power application drawing section can be arranged closer, so that the overall configuration Can be made thinner.
[0026]
Further, in the present invention, since the transparent sheet for shielding ultraviolet rays is disposed on the surface of the polymer dispersed liquid crystal, the polymer dispersed liquid crystal can be used even in an outdoor use environment where sunlight is directly irradiated. This has the effect that deterioration can be prevented as much as possible.
Furthermore, in the present invention, since the presence or absence of an electric charge application state is drawn on the plate of the light storage material to form the power application drawing unit, the light accumulated in the light storage material is drawn even in a dimmed state. The content can be displayed as a backlight, which has the effect of enabling more accurate and reliable display.
[Brief description of the drawings]
FIG. 1 is an overall schematic configuration diagram of a high-voltage cable power display device according to a first embodiment of the present invention.
FIG. 2 is an enlarged view of a main part of the high-voltage cable power display device shown in FIG. 1;
FIG. 3 is an operation equivalent circuit diagram block diagram of a main part of FIG. 2;
FIG. 4 is a view showing a power application display mode in the high voltage cable power application display device shown in FIG. 1;
FIG. 5 is a cross-sectional view of a main part of a high-voltage cable power display device according to a second embodiment of the present invention.
FIG. 6 is an operation equivalent circuit diagram of a main part shown in FIG. 5;
FIG. 7 is a view showing a power display mode of a power display device for a high-voltage cable according to another embodiment of the present invention.
FIG. 8 is an overall sectional configuration diagram of a conventional high voltage cable power display device.
FIG. 9 is an overall sectional configuration diagram of a conventional high voltage cable power display device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Intermediate connector 2, 2a, 2b Polymer dispersion type liquid crystal 3 Power application drawing part 4 Control part 10, 110, 210 High voltage cable 11, 211 Center conductor 12, 112, 212 Insulating layer 13, 213 Shielding layer 13a Grounding shielding layer part 13b Non-grounded shielding layer part 21, 22, 21a, 21b, 22a, 22b Electrode lead part 22c Connection clip 23, 24 Lead wire 41 Outer part 102 Liquid crystal display part 113a Insulation coating part 113b Non-grounded part 202 Electro-optical element 213b Drive electrode

Claims (6)

In a power application indicator of a high-voltage cable for displaying an application state of a high-voltage cable formed by laminating an insulating layer, a shielding layer, and an insulating sheath on an outer periphery of a center conductor,
The conductive material or the semiconductive material forming the shielding layer of the high-voltage cable is grounded, and the conductive material or the semiconductive material is separately formed and grounded, and the ungrounded ungrounded A shielding layer portion,
A polymer-dispersed liquid crystal connected between the ground shield layer and the non-ground shield layer,
A power application drawing unit that is disposed between the polymer dispersed liquid crystal and the insulating layer of the high-voltage cable and that determines whether or not the high-voltage cable is charged while being separated from the polymer dispersed liquid crystal by a predetermined distance;
The polymer-dispersed liquid crystal and the electrode lead portion of the polymer-dispersed liquid crystal are integrally molded, and the mold is formed with a thickness between the polymer-dispersed liquid crystal and the power application drawing section that is equal to or greater than the predetermined distance. And a transparent resin in which a hollow portion is formed in a substantially central portion in a region facing the power application drawing portion, wherein the power application display device for a high voltage cable is provided. The high voltage cable power display device according to claim 1,
The predetermined distance between the transparent resins is a distance that blocks light reflected by the power application drawing unit in a non-driving state of the polymer dispersed liquid crystal and is separated so that display contents of the power application drawing unit cannot be recognized. /> A high voltage cable power display device. The high voltage cable power display device according to claim 1 or 2,
The high-voltage cable power-supply display device, wherein the transparent resin to be molded forms an outer peripheral portion of the polymer dispersed liquid crystal with a thickness equal to or greater than the predetermined interval . The high voltage cable power display device according to any one of claims 1 to 3,
A power application display device for a high voltage cable, wherein a plurality of the polymer dispersed liquid crystals are stacked and disposed . The power display device for a high-voltage cable according to any one of claims 1 to 4,
A power-supply display device for a high-voltage cable, wherein a transparent sheet for shielding ultraviolet rays is provided on the surface of the polymer-dispersed liquid crystal . The power distribution display device for a high-voltage cable according to any one of claims 1 to 5,
A power application display device for a high-voltage cable, wherein the power application drawing unit draws the presence or absence of a power application state on a plate of a phosphorescent material .